Pump.



C. S. WRIGHT.

PUMP. APPLICATION FILED MAY15, 1914.

Patented July 6, 1915.

INVENTOR H ATTORNEY CLYDE So WRIGHT, F TOLEDO, OHIO ASSIGD TQR TO THE NiTIONAL SUPPLY UQMPAN'E.

or rotnno, OHIO, a, conronarrou or onto.

' PUMP.-

T all 'w/lom it may concern:

Be it known that l, CLYDE S. WRIGHT, a citizen of the United States, residing at T0- ledo, in the county of Lucas and State of llhio, have invented new and-useful linprovernents in Pumps, of which the following is a specification.

My invention and is particularly designed to serve as a slush pump for use with well-drilling apparatus. It may, however, be used for vari ous purposes.

ill

it is the object of my invention to provide a pump with a piston which will prevent the material pumped from passing between the piston and the inner surface of the pump barrel or linen More specifically, it is the object of my invention to produce a double acting pump provided with expansible packing forced htly into contact with the pump barrel or liner by the pressure of the fluid as it is forced from the pump. 1 provide near each end of the piston head a set of ex pansible packing rings separated by elastic material which, under the endwise moveof thesets of packing rings is caused iit tightly agai st the pump barrel or liner and prevent the passage of any fluid hetween the said material and the said harrel or liner.

Referring to the accompanying drawings), Figure l is a fragmentary View showing in longitudinal section a pump barrel, a pump piston or plunger and the piston rod; and Fig. 2, a cross-section on the line lll-l l of I Fi 1.

he the drawings, l have shown only a small portion 'of a complete pumping apparatus since my invention resides the pumppiston or p11 ger and the omitted parts of the said apparatus are well known. designates the punip'harrel within which cylindrical, liner 2 is secured in the is tl or in other manner. The cylindrical 'ston 3 which is operated by the piston rTod s: reciprocates within the said liner. li he iston head 5 comprises a cylindrical metalcylinder having a central opening o ierein for the piston rod J: and having its ;'Jeriphery reduced in diameter from its end the shoulder 7 near theinner id thereof. The reduced portion of e piston head is surrounded by two sets hydraulic packing rings t3 and do he was Specification of Letters Patent. Application filed may 15, 1914.

I said reduced portion of the relates generally to pumps the peripherv oi Patented July 6, third. Serial No. 838,703.

tween these two sets of packing rings place two steel rings l0 which surround the piston head and have their opposing laces divor ing inwardly or touard the piston rod.

ll. is a ring of elastic material such as ruhher situated betweenthe said steel rings and having its lateral faces inclined or tapered outwardly to correspond with the inclined faces of the ring-s10, The rings 10 and 11 are so constructed that looth the inner and the outer peripheries of the elastic ring ll may tightly engage the inner surface of the liner 2 and the outer surface of the said reduced portion of the piston head.

12 is a follower-seated against the outer ring of the set forced against-the the nut 13 working on the outer end of the piston rod 4-. The inner inernber of the set of rings 8 is in contact with the said shoulder 7 of the piston head. lWhen the nut 13 is screwed up against the follower 12, the rings 8, 9, l0, and 1-1 are pressed tightly together between 1e said shoulder '7 and the follower, thereby causing the packing rings 8 and 9 and the cla ll to engage the liner 2 more or less represents an annular passage cut in the piston head 5 opposite the of packing rings 9. This passage 1s shown opposite the cylindrical ring of said set but it may he placed opposite any one or more oi them. The outer end of the piston head is provided with ports 15 which communicate with the said annular passage 14.. lne follower 12 has the ports or opening 16 permitting the. passage of fluid to 'l is an annular passage which lies opposite the set of u packing rings 8 and has notion with respect to the rings 8 that the passage 14: has withrespect to the i v v 18 are ports leading irorn the inner end, the piston head to the said passage .ds uniing the piston 3 is movingc the right, the water which is heinp; driven hy the outer end of the piston will transmit its pressure throu h the ports 16 and 15 to the annular passage 14. The water pressure in the passage it is transmitted to the interior surfaces of packing rings g 'and causes them to he forced out tightly against the. liner 5% same the friction iii ' of the rings 9 on the I der 7 to forcethe rings 11 laterally and causing it to extend radially both toward and'away irom thev center of the piston and tightly into contact with the liner 2: and the reduced portion of the piston head. it is thus seen that it'would be impossible for any of the fluid, which is being forcedlto the right, to pass to the left beyond the elastic packing'ring 11. Very littie it any fluid can pass the rings 9, but in, case any should pass it would be efiectually stopped by the said ring 11. When the piston rod moves the piston 3 to the left the rings 8 are forced outwardly by the fluid which isdriven by the pump, and the elastic ring ll'is forced radially as before by reason of the friction of the rings 8 against the liner and the movement of the rings 9 and 10 toward the ring 11.

Although I have shown the rings 10 diagonal in cross-section I do not desire to be limited to this section since the rings mayhave various cross-sections and still be efiicient iorthe purpose of expanding the elastic packing 11'\radially. The non-expansible rings 10 are preferred between the elastic ring 11 and theddjacent packing rings since, if the rings 10 were omitted or were of soft material like the packing rings, the ring 11 would become merged with the adjacent lateral surfaces.

' .ln the claims 1 have used the word cylinder to cover the liner 2 or any other cylindrical surface in contact with which the piston may reciprocate.

it is seen that the cross-section of the ring 11 is quite large so as to provide suiiicient material to expand radially into close contact with the adj aceiit surfaces.

1i claiin- 1. In a double-acting force pump, a cylinder, anda piston reciprocable thereon and containing a piston head, annular spaced packings surrounding the piston head and adapted to engage the cylinder, annular elastic packing in the space between the said packings, and passages whereby the fluid driven by the piston presses one of the spaced packings toward the cylinder, in com.-

bination with means for driving the piston,

. the said means causing the elastic packing to be pressed laterally between the said spaced packings and expanded'radially.

2. in a double-acting force pump, a cylin:

.der, and a piston reciprocable thereon and containing a piston head, annular spaced packings surrounding the piston head and adapted to engage the cylinder, annular elastic packing in the space between the said packings, hard rings between the elastic packing and the adjacent packings, and passages whereby the fluid driven by the piston presses one of the spaced packings toward the cylinder, in combination with means for driving the piston, the said means causing the elastic packing to be pressed laterally between the said spaced packings and expanded radially.

3. In a double-acting force pump, a cylinder, and a piston reciproeable thereon and containing a piston head, annular spaced packings. surrounding the piston head and adapted to engage the cylinder, annular elastic packing with outwardly converging sides in the space between the said packings,

hard rings with diverging opposing iaces between the elastic packing and the adjacent packings, and passages whereby the fluid driven by the piston presses one of the spaced packings toward the cylinder, combination with means for driving the piston, the said means causing the elastic packing to be pressed laterally between the said spaced packings and expanded radially.

Signed at Toledo, Ohio, this 5th day of May, 1914-.

CLYDE S. 'WltlGl lT.

Witnesses 2 I C. H. finrnnnnnmn, DUE RnAMsNInnR. 

